chore: revert pod spec and test changes

[NicholasBlaskey]

Description

Reverts #8899 due to a security issue.

Test Plan

Commentary (optional)

Checklist

• Changes have been manually QA'd
• User-facing API changes need the "User-facing API Change" label.
• Release notes should be added as a separate file under docs/release-notes/.
  See Release Note for details.
• Licenses should be included for new code which was copied and/or modified from any external code.

Ticket

[netlify]

✅ Deploy Preview for determined-ui canceled.

Name	Link
🔨 Latest commit	437bb30
🔍 Latest deploy log	https://app.netlify.com/sites/determined-ui/deploys/65df9f5d6365c400072adcc8

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.16%. Comparing base (ef49195) to head (437bb30).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8920   +/-   ##
=======================================
  Coverage   47.16%   47.16%           
=======================================
  Files        1154     1154           
  Lines      175071   175070    -1     
  Branches     2237     2237           
=======================================
+ Hits        82575    82580    +5     
+ Misses      92338    92332    -6     
  Partials      158      158           

Flag	Coverage Δ
backend	42.27% <ø> (+0.01%)	⬆️
harness	63.69% <ø> (ø)
web	42.53% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
master/internal/rm/kubernetesrm/spec.go	71.62% <ø> (-0.08%)	⬇️

... and 5 files with indirect coverage changes